JPH0258580B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a recovery testing device for an oil buffer disposed in an elevator pit.

[Background of the invention]

In elevators, when a car or counterweight falls to the lower level of the hoistway during an accident, in order to catch it and stop it safely with an appropriate deceleration, as shown in Utility Model Publication No. 49-20678, etc. An oil buffer is installed inside the pit.

4 and 5 are explanatory diagrams showing the oil buffer provided in this elevator. FIG. 4 is an explanatory diagram showing the arrangement state, and FIG. 5 is a longitudinal sectional view showing the structure.

In Fig. 4, 1 is a car, 2 is a guide rail that guides the car 1 in the vertical direction, 3 is a rail bracket that supports the guide rail 2 and is fixed to the road wall, and 5 is a rail bracket that supports the car 1. A counterweight (not shown) is attached to the other end of the rope 5 for lifting and lowering. Reference numeral 4 denotes an oil buffer, which is installed directly on the bottom surface of the pit 4a or on a molded steel base placed on the bottom surface. As shown in FIG. 5, the oil buffer 4 includes a cylinder 6 having oil inside, a plunger 7 fitted into the cylinder 6 so as to be slidable in the vertical direction, and a plunger 7 disposed inside the cylinder 6. a return spring 8 that urges the cylinder 6 to return;
An adjustment rod 10 is fixed to the bottom surface of the plunger 7, extends concentrically with the oil injection hole 9 provided in the center of the bottom surface of the plunger 7, and passes through the oil injection hole 9, and has an appropriate taper determined by the magnitude of the braking force. It is composed of etc.
Note that the symbol A shown in FIG. 5 is an air hole formed in the upper side wall of the plunger 7.

The oil buffer 4 configured as described above is
In an emergency, it operates as follows. That is, for example, when the car 1 falls and collides with the upper surface of the plunger 7 and pushes down the plunger 7, the oil in the cylinder 6 is squirted into the plunger 7 from the gap between the adjustment rod 10 and the oil injection hole 9. Due to the orifice effect at this time, the oil in the cylinder 6 becomes high pressure, and an upward braking force is applied to the plunger 7, thereby decelerating the car 1. Moreover, the air inside the plunger 7 compressed by the descent of the plunger 7 is blown out from the air hole I provided in the plunger 7, thereby preventing a dangerous increase in internal pressure. Further, the air hole A guides air into the plunger 7 when the plunger 7 is raised by the return spring 8, thereby making the return operation smooth.

By the way, if such oil buffer 4 does not operate normally, it will lead to a serious accident, so by law, this oil buffer 4 must be operated once a year.
It is mandatory to conduct a reinstatement test.

Conventionally, this return test was performed by a worker who entered the pit 4a and the car 1, respectively. Length 1.5~2m
erect a square timber of approximately
After descending by a predetermined stroke, the car 1 or the counterweight is moved upward, and the plunger 7 is raised by the force of the return spring 8. If the plunger 7 returned to the predetermined return position within a predetermined time (usually 90 seconds), the test was deemed to have passed.

However, the conventional recovery test performed in this manner has the following drawbacks.

(1) Normally, the worker in the pit 4a instructs the worker in the car 1 to raise or lower the car 1 or the counterweight by saying, for example, "lower it a little more" or "raise it." However, since there is communication between the inside of the pit 4a and the inside of the car 1, this communication is difficult to establish, and therefore it takes a lot of time to conduct the test, and no improvement in test efficiency can be expected.

(2) Also, as shown in (1) above, inside the pit 4a,
When the workers in car 1 were calling out to each other, the worker in pit 4a called out to him, "Lift up!" If car 1 or the counterweight is lowered, there is a risk of serious accident.

(3) Also, since the test is conducted by simply placing a square piece of wood at a high position on the top surface of the plunger 7,
The support of the square timbers is likely to be unstable and therefore there is a danger associated with this timber square timber.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned actual situation in the prior art, and its purpose is to provide an oil buffer recovery test device that can be tested by a single operator without the intervention of a car or a counterweight. Our goal is to provide the following.

[Summary of the invention]

In order to achieve this object, the present invention provides an operating force applying device different from a car or a counterweight, which applies an operating force to gradually lower a plunger into a pit in which an oil buffer is arranged, and this operating force applying device. The structure includes a release device for releasing the operating force applied to the plunger by the plunger.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The oil buffer recovery test device of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view showing the overall configuration of a first embodiment of the present invention, and FIG. 2 is a perspective view showing a head guide portion provided in the first embodiment shown in FIG.

In Figure 1, 4 is an oil buffer, 6, 7
The cylinder and plunger, 4a and 4a, respectively, constitute the oil buffer 4, and the pit is as described above. Also, 22a, 22
b is a ring anchor fixed to the bottom of the pit 4a and placed on opposite sides of the cylinder 6; 11 is a long body such as a belt, and has a hook 12a at one end that engages with the ring anchor 22a; It fits into a head guide 17 (described later) placed on the upper surface of the plunger 7, and the other end is fixed to a drum of a belt winding device 13 (described later).

As shown in FIG.
hanging pieces 17b formed on both ends of the flat part 17a and capable of fitting into the head of the plunger 7; and rising pieces 17b formed on the sides of the flat part 17a to prevent the belt 11 from falling off the flat part 17a. It consists of piece 17c. Reference numeral 18 denotes a bracket disposed below the head guide 17, which is fixed to the head guide 17, for example, and includes a flat portion 18a having a longitudinal direction perpendicular to the longitudinal direction of the flat portion 17a of the head guide 17, and a flat portion 18a. A hanging piece 1 formed at both ends of the plunger 7 and capable of fitting into the head of the plunger 7.
8b.

The belt winding device 13 described above is, for example, a commercially available device (manufactured by NSK Ltd., etc.), and as shown in FIG. Ratchet 1
6b, and a stopper 1 which can be engaged with this ratchet 16b by the biasing force of a spring (not shown).
6a and this stopper 16a to ratchet 16b.
A lever 16 is supported so as to be movable toward and away from the drum, and is rotatable relative to the drum and the ratchet 16b. Cam 1 provided on lever 16
It is provided with a stopper 15a that can be engaged with the stopper 6c, and a bracket 15 that movably supports the stopper 15a.

Reference numeral 14 denotes another elongated body, such as a belt, which has one end hooked to the bracket 15, and the other end has a hook 12b that engages with the ring anchor 22b described above.

The ring anchors 22a and 22b described above, the belt 11 having the hook 12a, and the head guide 1
7 and bracket 18, belt winding device 1
3, and a belt 14 having a hook 12b
constitutes an operating force applying device that applies an operating force to gradually lower the plunger 4, and in particular, the belt winding device 13 described above also serves as a release device that releases the operating force.

Next, a recovery test of the oil buffer 4 performed in the embodiment configured as described above will be explained.

First, as shown in FIG. 1, the bracket 18 and head guide 17 are placed on the upper surface of the plunger 7, and the belt 11 is stretched around the head guide 17.
The hook 12a is engaged with the ring anchor 22a, and the hook 12b of the other belt 14 is engaged with the ring anchor 22b. In this state, when the lever 16 of the belt winding device 13 is rotated upward in the direction of the arrow 20 in FIG. Along with the rotation in the direction, the ratchet 16b rotates in the direction of the arrow 20,
The drum around which the belt 11 is wound rotates integrally with the ratchet 16b in the direction of arrow 20, and the belt 11 is wound around the drum. When the lever 16 is rotated downward in the direction of the arrow 21, the end of the stopper 16a engages along the curved back of the teeth of the ratchet 16b, thereby causing the stopper 16a to engage with a spring (not shown). move in the direction of arrow 20a against the force of
On the other hand, since the stopper 15a remains engaged with the ratchet 16b, the ratchet 16b or the drum does not rotate and the belt 11 is not rewound. Then, lever 1 mentioned above
By repeating the vertical rotation of 6, the belt 11
is wound up in the drum, thereby causing the plunger 7
gradually descends to the final lower end position.

When such a state occurs, the stopper 16a is moved in the direction of the arrow 20a by an appropriate means against the force of a spring (not shown), and the lever 1 is released with the stopper 16a and the ratchet 16b disengaged.
6 is rotated upward in the direction of arrow 20, the cam 16c of the lever 16 engages with the stopper 15a, and the stopper 15a descends in the direction of arrow 20b against the force of a spring (not shown). 15
a is disengaged from the ratchet 16b, that is, the operating force applied to the plunger 7 is released,
The ratchet 16b, that is, the drum, becomes rotatable, and the plunger 7 is raised by the force of the return spring (corresponding to spring 8 in FIG. 5) provided in the cylinder 6 mentioned above. And this plunger 7
If the movement time to the predetermined upper end position is within 90 seconds, the test is completed as a pass. After the test is completed, all devices and instruments such as the belt winding device 13, head guide 17, bracket 18, belt 11, etc. are removed.

According to this first embodiment, the test can be carried out by only the worker in the pit 4a, and the test can be carried out by just one worker without the intervention of a car or counterweight, improving the test efficiency. Furthermore, since there is no intervening car or counterweight, and there is no need to arrange square timbers, the test can be carried out safely.

In addition, a head guide 17 is provided on the top surface of the plunger 7.
Since this is provided, the belt 11 can be smoothly transferred to the belt winding device 13 side, contributing to an improvement in test efficiency.

Further, a bracket 18 is integrally provided at the lower part of the head guide 17, and the head guide 17 and the bracket 18 are provided with four hanging pieces 17b and 18b that can be engaged with the head of the plunger. and bracket 18
can be easily positioned on the plunger 7, and is reliably prevented from falling off the plunger 7, contributing to ensuring safety.

In addition, although the belts 11 and 14 were mentioned as an example of a long body in the said 1st Example, this invention is not limited to this, It is also possible to replace with a rope, a chain, etc.

Further, in the first embodiment, the belts 11, 1
The hooking fittings 12a, 12b of No. 4 are engaged with ring anchors 22a, 22b attached to the bottom of the pit 4a.
Metal fittings corresponding to a and 22b may be fixed to the molded steel base supporting the oil buffer 4 or to the cylinder 6.

FIG. 3 is a front view showing the overall configuration of a second embodiment of the present invention. In this second embodiment,
A pair of stoppers 30 are fixed to the hoistway wall in the pit 4a, and brackets 31, for example, are attached to these stoppers 30. A hydraulic jack 32 is installed between the upper surface of the plunger 7 constituting the oil buffer 4 and the bracket 31. is interposed therebetween, and is configured to supply oil from a pump 33 to this hydraulic jack 32.

In this second embodiment, a stopper 30, a bracket 31, a hydraulic jack 32, and a pump 33 are used.
constitutes an operating force applying device that applies an operating force to gradually lower the plunger, of which a hydraulic jack 32, a pump 33, and this pump 33
A valve that opens so that the oil contained in the plunger is returned to the tank also serves as a release device that releases the operating force applied to the plunger 7.

In this second embodiment, the hydraulic jack 32 is extended by supplying oil from the pump 33 to the hydraulic jack 32, and since the head of the hydraulic jack 32 is locked to the bracket 31, the plunger 7 gradually descends to a predetermined lower end position. In this state, when the valve built in the pump 33 is opened, the oil in the hydraulic jack 32 is returned to the tank via the pump 33, and the hydraulic jack 32 is contracted by the force of the spring provided in the cylinder 6. The plunger 7 then rises to a predetermined upper end position. If the time required for the plunger 7 to rise to the upper end position at this time is within 90 seconds, the test is passed.

The second embodiment configured in this manner also allows a single worker to perform the return test of the plunger 4 without intervening a car or a counterweight, improving test efficiency and ensuring safety. . The hydraulic jack 32 has a larger bottom diameter than the upper diameter, so unlike the conventionally used square timbers, the hydraulic jack 32 can be placed relatively stably on the top surface of the plunger 7. During the return operation, the hydraulic jack 32
Because it takes a contracted state, which is a more stable form, it is safer than conventional square timbers, and safety can be ensured in this respect as well.

〔Effect of the invention〕

Since the oil buffer return test device of the present invention is configured as described above, the test can be performed by a single operator without the intervention of a car or a counterweight, and is more effective than conventional methods. It can improve efficiency and has an excellent effect on safety.

[Brief explanation of the drawing]

FIG. 1 is a front view showing the overall configuration of the first embodiment of the oil buffer recovery test device of the present invention, and FIG.
The figure is a perspective view showing the head guide portion provided in the first embodiment shown in FIG. 1, FIG. 3 is a front view showing the overall configuration of the second embodiment of the present invention, and FIGS. The figure is an explanatory diagram showing an oil buffer provided in an elevator, FIG. 4 is an explanatory diagram showing an arrangement state, and FIG. 5 is a longitudinal cross-sectional view showing its structure. 4...Oil buffer, 6...Cylinder, 7...
... Plunger, 11, 14 ... Belt (long body),
12a, 12b...Hooking fitting, 13...Belt winding device, 17...Head guide, 17a...Flat part, 17b...Descent piece, 17c...Rising piece,
18...Bracket, 18a...Plane part, 18b
... hanging piece, 22a, 22b ... ring anchor, 30 ... stopper, 31 ... bracket, 3
2...Hydraulic jack, 33...Pump.

Claims (1)

[Claims] 1. A cylinder disposed in a pit and having oil inside, a plunger slidably fitted into this cylinder, and a return spring that biases this plunger to return, and an orifice effect obtained when oil in the cylinder moves to the plunger side when the counterweight collides with the top surface of the plunger;
In the oil buffer return test device that buffers and stops the car or the counterweight by the spring effect of the return spring, an operating force applying device that applies an operating force to gradually lower the plunger in the pit. An oil buffer recovery test device, comprising a release device for releasing the operating force applied to the plunger by the operating force applying device.